Island



(No Model.)

G. W. STAFFORD & 0 H. POLAND.

JAGQUARD ATTACHMENT FOR LOOMS.

Patented Jan. 28, 1890.

,--L V 0 "2 1'? i :l x x III J o .40 /c /A my C r"\ t 0 K91 E: ii WITNESSES:

INVENTDHS V ments for close -shed looms, and is an im- UNITED STATES PATENT DFFICE.

GEORGE W. STAFFORD AND CHARLES H. POLAND, OF PROVIDENCE,

RHODE ISLAND.

JACQUARD ATTACHMENT FOR LOOMS.

SPECIFICATION forming part of Letters Patent No. 420,119, dated January 28, 1890.

Application filed September 2, 1889.

To all whom it may concern:

Be it known that we, GEORGE W. STAF- FORD and CHARLES H. POLAND, of Providence, in the county of Providence and State of Rhode Island,have invented certain new and useful Improvements in Jacquard Attachments for Looms; and we do hereby declare that the following is a full, clear, and exact description thereof, reference being had to the' accompanying drawings, and to the letters of reference marked thereon which form a part of this specification.

This invention relates to Jacquard attachprovement on the invention described in United States patent of September 3, 1889, No. 410,215, and is in the same direction that of modifying the movements of the grids when approaching each other.

As the attachments aforesaid are usually constructed the two grids in approaching each other continue to move until bothstop and the weight of the hooks rests on the lower grid-som etimes before either grid stops the upward motion of the lower grid being continued to free the ends of the hooks from the bars of the upper grid with which they are engaged. In this continued upward motion of the lower grid after it has received the weight of the hooks and harnesses attached to them the grid sustains a burden sometimes amounting to four hundred or five hundred pounds. Suddenly arresting the downward movement of this great weight and giving it an upward motion gives a shock to the machinery and produces a great strain on the crank-shaft which operates the attachment just at the time when the loom is doing its hardest work-that of beating up the fillingand this shock is repeated when the upper grid rises and takes up the hooks again, for they already have a downward movement from the return motion of the lower grid, and are in a manner dropped onto the upper grid, instead of being picked up from a stationary position. These shocks are destructive to the mechanism and limit the speed of the loom, besidescausing many breaks in the harnesses and warps. WVe overcome this difficulty by causing the lower grid to get through with its Serial No. 322,645. (No model.)

upward motion and come to a state of comparative rest before the lower ends of the hooks reach it, and, further, we so arrange the actuating devices for the lower grid that the shock of receiving the weight of the descending hooks is transferred from the main lever that connects the attachment with the loom to the pivot of the intermediate arm or lever that moves the lower grid. Agaimin our construction, when the upper grid again picks up the hooks after the selection thereof for a new shed, they are taken from a state of comparative rest and are not seized during downward movement. Oonsequentlythe said grid has to overcome only the inertia of the weight of the hooks and connected' harness without the momentum of a downward movement added thereto. sirable results by connecting the lower grid by a bar or link with a rocking arm (herein shown asone arm of a knee-lever) actuated by intermediate connections from the main operating-lever, which arm is so disposed as to bring the point of connection between it and the connecting bar or link approximately in line with the axis of the arm and the point of connection of the bar or link with the lower grid-that is to say, on the center--at the e secure the foregoing de- 7 time when the descending hooks are received by the said lower grid and before the upper grid has terminated its descent and maintain the said lower grid in a state of comparative rest until after the hooks have been selected for the next shed and engaged by the upper also serves as a guide for the table of the lower grid 1), that is attached to the collar d, which slides on the rod.

The main lever B gives the upward and downward motion to the tables, said lever being actuated from a crank on the crank-shaft of the loom. This lever B moves the upper grid at by means of the bar 0, which is pivoted at its upper end to the grid-table and at its lower end to the bar B near its innerend.

The lower grid is moved through the medium of a knee-leverO, which rocks on a pivot 2', held in bearings in line, or nearly so, under the rod J. To the upper end of the knee-lever O a bar 8 is pivoted, that has its upper end pivoted to the sliding collard, attached to the lower grid. The other end of the knee-lever O is connected by the' bartto the main lever B at the inner end of that lever. It will readily be seen that as the inner end of the lever B descends and lowers the upper grid by the bar 0 the connection twill push down the horizontal end of the knee-lever and raise the other end, raising the lower grid by the bar 8 until the two pivots of that bar are in a line with the bearing of the knee-lever, and while approaching and passing that line the motion will be imperceptible, ceasing entirely whileon the line. At the same time the upper pivot of the knee-lever is passing this center line'the main lever B will continue to move the upper grid down, and will start on its upward movement shortly before the u-pperpivot of the knee-lever repasses the centerline, so-that by properly timing the movements the lower grid will be resting solidly .on the main pivot of theknee-lever when it receives the impact of the descending hooks, and also again when they are taken off by the upper grid.

The other parts of the attachment are constructed and operated in like manner as described in the patent of September 3,1889.

Having thus described our improvements, 40 what we claim as our invention is- '1. The combination, with the upper grid, the lower grid, and the operating-lever B, of actuating-connections intermediate the said lever and the grids embracing a rocking arm connected by a bar or link with the lower grid, the said arm being disposed to bring the point of connection between the same and the connecting bar or link approximately on the center at the time whenthe descending hooks are received by the said lower grid and before the upper grid has terminated its descent and maintain the said lower grid in a state of comparative rest until after the hooks have been selected for the next shed and engaged by the upper grid.

2. The combination, with the upper grid, the lower grid, and the operating-lever B, of actuatingrconnections intermediate the said lever and the upper grid, a knee-lever 0, connected with leverB, and a link connecting-the lower grid with one arm of the knee-lever, the said arm being disposed to bring the point of connection between the same and the connecting bar or link approximately on the center at the time when the descending hooks are received by the said lower grid and before the upper grid has terminated its descent and maintain the said lower grid in a state of comparative rest until after the hooks have been selected for the next shed and engaged by the upper grid.

GEO. V. STAFFORD. CHARLES H. POLAND.

\Vitnesses:

J. A. VIoKERY, BENJ. ARNOLD. 

